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CVE-2026-28490 - Vulnerability Analysis

MediumCVSS: 6.5

Last Updated: March 17, 2026

Authlib - Cryptographic Padding Oracle

Published: March 16, 2026Updated: March 17, 2026PoC AvailableRemote Exploitable

Overview

Authlib Python library < 1.6.9 contains a cryptographic padding oracle vulnerability caused by improper handling of the JWE RSA1_5 key management algorithm, letting attackers decrypt sensitive data, exploit requires use of RSA1_5 algorithm.

Severity & Score

Severity: Medium

CVSS Score: 6.5

Impact

Attackers can decrypt sensitive encrypted data, leading to information disclosure.

Mitigation

Upgrade to version 1.6.9 or later.

References

https://github.com/authlib/authlib/commit/48b345f29f6c459f11c6a40162b6c0b742ef2e22
https://github.com/authlib/authlib/releases/tag/v1.6.9
https://github.com/authlib/authlib/security/advisories/GHSA-7432-952r-cw78

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Details

CVE ID: CVE-2026-28490
Severity: Medium
CVSS Score: 6.5
Type: weak_cryptography
Status: confirmed

CWE

CWE-203

CVSS Metrics

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N